This is #4 main and it was not starved for oil,the reason that I I’m still trying to tie this down to the rod bolt is because this engine is not a just built engine it’s been running and racing for over 10 years with no oil problems.So it’s kind of hard for me to have to except the oil problem,and there are no other things to be done to the block to improve the oil system.The only change that I made was installing a windage tray and a different manufacturer head gasket.It will be hard to do a rebuild thinking there is a oil system problem.

You do not have the required permissions to view the files attached to this post.

This is #4 main and it was not starved for oil,the reason that I I’m still trying to tie this down to the rod bolt is because this engine is not a just built engine it’s been running and racing for over 10 years with no oil problems.So it’s kind of hard for me to have to except the oil problem,and there are no other things to be done to the block to improve the oil system.The only change that I made was installing a windage tray and a different manufacturer head gasket.It will be hard to do a rebuild thinking there is a oil system problem.

You had an oil issue, killed the rod bearing & it hammered the bolt till it failed.
Wiped main bearing + blue rod = spun rod bearing due to oil supply issue.

End of story, you can look at that bolt as hard as you like but you'd be better off spending your time looking for the cause of the oiling issue with that rod. Pull #4 rod & check the bearing, it feeds off the same main as #7, if it's ok that tells you something, if it's shot that also tells you something.

Just as tk said,
I would want to know what your bearing clearances were last time and whether you had full groove mains or not.
When it was rebuilt, what were the clearances, were the mains full or half or 3/4 groove.
You have an oiling issue whether you want to hear it or not.
Cheers

G,day,
Last time for me
What style of mains last time, full groove, 3/4 or half?
What big end clearance?
How is the oiling system set up?
what lifters?
How high do you turn it on the shift and across the stripe?
Internal or external balance, 28 or 50 oz?
Clevelands will shit 2 and 7 every time before the rest with a stock crank if not set up right depending on how high your turning them.
Paul